Oil-pboof-papeb comtaibteb and pbocess of making



through in many cases.

CARLETON ELLIS, OF MONTCLAIR, NEW JERSEY OIL-PROOIE -PAIER CONTAINER AND PROCESS OF MAKING SAME.

No Drawing.

To all whom it may concern:

Be it known that I, CARLETON ELLIS, a citizen of the United States, and a resident of Montclair, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Oil-Prooflaper Containersand Processes of Making Same, of which the following is a specification. A

This invention relates to a shipping package or similar container intended for packaging and shipping oils and fats, lard, butter and the like and to the'process of making same, and relates especially to a container of paper or a paper-like structure or similar fibrous material coated or impregnated with waste sulfite cellulose liquor solids.

In carrying out the present invention I may use sulfite liquor solids obtained from concentrated sulfite liquor using either the syrupy form of the concentrated liquor or a dry powder obtained, for example, by atomizing the sulfite liquor by means of a drying gas. In which-ever way the sulfite cellulose waste liquor is applied in gravity preferably ranging between 10 and 30 B. and on dryingforms a varnish-like or glazed surface which is not readily penetrated by oils or fats, thereby enabling the container to be used for holding lard or lard compound, butter and other edible fats, animal, vegetable and mineral oil and the like. When the sulfite liquor by itself is used, especially as a coating or impregnating material for thin paste board boxes, it is found that the material is too brittle to stand severe handling, the coating cracking and permitting the oil or fat to work If, however, the sulfite liquor solution is mixed with a soften ing agent such, for example, as glycerin or similar hygroscopic material the sulfite cellulose waste liquor solids lose their brittleness and cracking does not readily occur. In place of glycerin, various glycerin substitutes now on the market, and in some cases hygroscopic solids such as calcium chlorid, potassium acetate and the like may be used.

The sulfite cellulose waste liquor may be in the acid form, partially neutralized state, or in a neutral or even basic condition depending u on the requirements of the operatwn.

Specification of Letters Patent.

obtained it is the form of a solution of a' he support may be made of Patented Jul 29, 1919.

Application filed January 23, 1918. Serial No. 213,381.

paper, tissue or other material and may be slmply coated or impregnated, or both impregnatedand coated. One or more applications of the composition maybe given. It may be applied by dipping, brushing, spraying and the like. In some cases it is ossible to incorporate fibrous material with t e sulfite liquor and a softening agent and make up into an oil-proof paper.

Impregnation of the paper or other tissue may take place readily when the material is porousby simpleapplication, for example, paper similar to blotting paper will take up the concentrated liquor very readily indeed. On the other hand some grades of paper are diflicult to impregnate, but by eating and dipping the heated container into sulfite liquor and allowing to cool, impregnation is secured. Pressure may be applied to assist in the impregnation. Only the inner surface of the container is coated in some cases (6. g., by spraying) leaving the exterior of any desired color unaffected by the sulfite liquor.

The sulfite liquor coating agent may be made up from atomized dry sulfite liquor waste solids dissolved in water to form a solution of the requisite strength. This may be about 20 B. A suitable addition of glycerin or calcium chlorid may be made to serve as a softening agent. Too much calcium chlorid will tend to precipitatethe sulfite liquor solids,

some cases.

Using concentrated sulfite liquor of 30 B. I have found two volumes of the liquor to one volume glycerin is satisfactory, for example, in a dry climate, while in climates of a more humid character a proportion of four parts of the sulfite liquor to one part of g ycerin may be applied. With five parts of the sulfite liquor concentrate of the above mentioned proportions the coating is likely to be a trifle too brittle forsome purposes, so that at the corners and edges of the package cracking may tainer is sprung out of shape. However, I do not wish to express any precise limitation of softening agent to be used, the amount depending entirely upon the character of the package in hand. If the walls of the latter are quite still and not easily sprung the glycerin may be reduced in amount or even entirely omitted in some cases.

An addition of glue or dextrin, sodium so that the solutionwilll thicken too greatly to be readily applied in.

occur if the conhibited. In fact molasses may be used to silicate, etc., to the sulfite liquor may be made, if desired, but as a general rule it may be stated that the sulfite liquor solely or with merely a softening agent is to be preferred. .The" danger with glue, dextrin and the like is that on exposure in damp places, as for example after standing for sometime on store shelves for a, long period, mold will form on the surface of the pack age and give it an unsightly appearance. This is especially objectionable in the packages intended to hold edible products such as butter, lard and the like. Sulfite liquor solids do not readily become moldy and do not require the addition of a preserving agent such s usually would be required for substances serving as a nutrient medium forthe growthof molds and bacteria, such as glue or dextrin. However, the-addition of glue, dextrin, sugar, molasses and the like to the present composition is not proreplace the glycerin in 'whole or in part. In this case it may be desirable to add a preservative such as borax or. boric acid, enzoic acid and the like, especially some form of preservative which is not readily taken up by oils and fats, so that in case of an'edible product contamination will not arise from that source. In packaging products such as wheel grease, gear grease, petroleum hard oil, etc., the nature of the preservative is of minor importance.

In some cases, however, especially for packaging inedible material a preponderatmg amount of glue or dextrin may be used with a lesser amount of sulfite 1iquor. This may be done in the case of. sizing. for wooden barrels and the like,

or the latter may be sized with the sulfite liquor solids alone or with or Without the use of a softening agent.

The size may be forced into the wood by pressure andcentrifugal action and dried proofing agent.

by passage of heated air through the barrel. In this manner barrels for holdin petroleum oil, cottonseed oil and the like may be prepared, whichifi coated-with sulfite liquor solids alone will not become moldy.

In some casesthe sulfite liquor employed have a slightly burnt or caramelized in which case it may be desirable to up the. treated containers in a current may odor, heat of air for a brief period, which tends to deodorize the material so that no disagree;

able odor or flavor is imparted to a compound of the nature, for example, of lard or butter.

Paper receptacles may be coated with the Y ulfite liquor material on the inside and with a waterproofing substance, such as paraflin on the outside. Thus a duplex container or effect is obtained, an oil-proof and Waterproof package resulting.

What I'claim is 1. The process of making an. oilproof paper container which comprises impregnating a paper receptacle with waste sulfite cellulose liquor solids and glycerin.

2. A container for oils, fats, and the like which comprises a paper receptacle carrying sulfite-waste liquorsolids and glycerin as an oil and fat proofing agent.

3. A container for oils, fats and the like which comprises a paper receptacle carrying sulfite waste liquor solids and a hygroscopic substance as a fat-proofing agent.

4. A container for oils, fats and the like which comprises a fibrous structure oilproofed with sulfite waste liquor solids and a hygroscopic agent. i Y

5. A container for oily and fatty material which comprises a paperreceptacle carrying acid sulfite waste liquor solids and a hygroscopic substance as an oil and. fat- IOARILEKION ELLIS. 

